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    5.7 Merc Alpha One Gen one violently shakes entire boat?!

    I'll check that the next time I get to the boat, thanks!
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    5.7 Merc Alpha One Gen one violently shakes entire boat?!

    I suppose anything is possible!
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    5.7 Merc Alpha One Gen one violently shakes entire boat?!

    I did go with the RPMs. But today I just ran the engine, the drive is currently off. I was going to pop the drive cap, but I've not had that off before and I'm not sure I could accomplish anything! The drive shaft and U joints look good, and turning it by hand there are no weird...
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    5.7 Merc Alpha One Gen one violently shakes entire boat?!

    Well, the thump/vibration was literally so violent that I would not have tried...plus I was THIS close to my slip. But definitely not random. I just got back from the club and ran that engine. No noises or vibration or anything abnormal at idle or rpms.
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    5.7 Merc Alpha One Gen one violently shakes entire boat?!

    It only happens with the port drive. I don't know that I'd want to swap drives with them being counter-rotating (then forward is reverse and reverse is forward...) I have not started it up without the drive off (just took it off last weekend)...I may do that today, but I imagine I would learn...
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    5.7 Merc Alpha One Gen one violently shakes entire boat?!

    Doubtful...not just a thud or random. I know I'm not explaining the shaking well, but it was maybe like driving a car with a square wheel.
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    5.7 Merc Alpha One Gen one violently shakes entire boat?!

    They are Merc Certified Techs, and I had informed them that it was counter-rotating. But that drive was working fine for a time, I had planning on running up the river to test out but pretty quick the other engine was not working right so I turned around and came back in. While maneuvering into...
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    5.7 Merc Alpha One Gen one violently shakes entire boat?!

    Thanks! That was my plan. When I but in a new impeller I noticed play in the prop shaft, so I took it to the marina and they replaced bearings in the lower unit. If they'd seen anything in there that didn't look good, they SURELY would have replaced/charged me!! Props are brand new...
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    5.7 Merc Alpha One Gen one violently shakes entire boat?!

    Thanks so much! Both drives had been off for servicing lower units by me. I installed new starboard engine and I had marina align it. Then when both didn't shift correctly, I returned to marina and they also had both drives off and reinstalled, which was in September. The problem drive is off...
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    5.7 Merc Alpha One Gen one violently shakes entire boat?!

    Sorry if this is so long, but in desperate need of help!! I have a 1988 Celebrity Crownline Cruiser 28 with twin Merc 350s and Alpha Ones. I bought the boat cheap in the fall of 23 because it had a bad engine (starboard). Have been working on it since. Mostly myself, but last year I gave up and...
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